Evaluation employees of a firm receive annual reviews in a


Evaluation employees of a firm receive annual reviews. In a certain department, 4 employees received excellent ratings, 15 received good ratings, and 1 received a marginal rating. If 3 employees in this department are randomly selected to complete a form for an internal study of the firm, find the probability that

(a) all 3 selected were rated excellent.
(b) one from each category was selected.

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Basic Computer Science: Evaluation employees of a firm receive annual reviews in a
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